A dairy can holds 90 litres of pure milk. Nine litres are taken out and replaced with water, and the same is done once more with the mixture. How many litres of pure milk does the can now contain?

Question

Accepted Answer

72.9. Each operation keeps (1 − 9/90) = 0.9 of the milk. Milk left = 90 × 0.9 × 0.9 = 72.9 litres.

A dairy can holds 90 litres of pure milk. Nine litres are taken out and replaced with water, and the same is done once more with the mixture. How many litres of pure milk does the can now contain?

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